Which military product design innovation from WWII was later marketed to civilians as the 'Jitterbug' before becoming one of the most successful consumer products in retail history?

After World War II, numerous military technologies and products found their way into civilian markets, fundamentally changing retail landscapes and consumer habits. Many items we take for granted today began as military innovations that underwent significant product design transformations to become commercial successes. This trivia tests your knowledge about one of the most influential military-to-civilian product transitions that revolutionized retail sales and created entirely new market trends.

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Walkie-talkie communications device
Microwave oven (originally called the 'Radarange' based on radar technology)
Aerosol spray can dispenser
Jeep all-terrain vehicle